Closure



March 8,1927.

1,620,316 L. E. BALTZLEY CLOSURE Filed June 1, 1925 6 6ISVENTOR Patented Mu. s, 1927.

UNITED STATES LOUIS I. BALTZLEY, OI GLEN BTDGE, NEW JERSEY.

CLOSURE.

Application filed June 1, 1926. Serial Jl'o. 112,742.

The present invention relates articularly to closures for paste tubes and t e like.

Special objects of the invention are to provide a simple, practical and inexpensive closure of the screw type, which can be quickly turned to allow free discharge, without removal from the container, which will form a perfect sealwhen closed and in which the screw threads will be fully protected from the paste or other material.

The various novel features of construction, combination and relation of parts by which the foregoing and other objects are attained are set forth in detail in the following specification.

The drawing accompanying and forming part of the specification illustrates one practical commercial embodiment of the invention as applied to a paste dispensing tube.

It should be understood, however, that the invention is not limited to this use or to this articular form of structure-as will appear rom the scope of the appended claims.

Figure 1 1s a partial plan and vertical 2 section of the closure.

Figure 2 is a part sectional side view of the same with the cap in closed position.

Figure 3 is a full sectional view showing the ca opened for discharging the contents and s owing how even in this fully open position the screw threads are sealed against the paste.

Figure 4 is a further enlarged sectional detail of the combined seal for the discharge ports and screw threads.

The container 5 is shown as of the usual collapsible tube variety having a discharge neck or nozzle 6. This neck is of special construction in that instead of being fully open it "is closed at the center by a closure portion 7 and open about the sides of this central portion by way of one or more ports 8.

The discharge neck is externally screw threaded about its base portion at 9 and .above this "screw threaded part, it is shown as having a smooth cylindrical portion 10.

Engaging over the neck is a cap 11 having a central dischar e mouth 12 in line with the central close portion 7 of the neck. This cap is internally screw threaded at 13 to fit the screw threads of the neck and above these screw threads it is shown formed with a smooth internal cylindrical portion 14.

The cylindrical inner portion 14 of the cap forms a seat for a cylindrical sealing ring 15 having an annular extension 16 overlying the ports in the neck. This cap sealing member is shown as held in place in the cap by being sprung over the screw threads into its seat in the end'of the cap.

The end of the neck and the overstandin portion of the cap may be somewhat conical in shape, as illustrated, or be rounded, flat or otherwise shaped, and the combination seal or gasket within the cap will be shaped accordingly.

The closed central portion of the neck is illustrated as having a plug or extension 17 designed to enter and close the central openings in the gasket and cap when the cap is closed as in Figure 2. To prevent entire removal of the cap, the same may be formed with an inturned bead 18 at its open end to engage under a shoulder such as 19 provided at the lower screw thread on the neck.

In the closed osition indicated in Figure 2 it will be noted that the top part 16 of the gasket completel seals the ports in the end of the neck. W en the ca is unscrewed as indicated in Figures 3 an 4, the ports are uncovered and the paste or other material is free to escape through the central discharge orifice in the ca At this time, however. the annular portlon or skirt 14 of the gasket still covers the cylindrical upper portion of .the neck and so prevents any How of paste back over the screw threads of the cap or neck. As the cap is screwed down, this 0 lindrical seal rides down over the cylinrical portion of the neck until it touches or substantially reaches the upper thread on the neck where, as in Figure 2, it completely seals both sets of screw threads. In the closing movement of the cap the plug element 17 shuts off the discharge orifice before the ports are closed and any material remaining in the cap is therefore forced back into the tube or container, the seal at this time becoming particularly useful by preventing such material being forced back into the screw threads. Thus, not only are the screw threads protected. but loss of material which would occur if the material reached the screw threads, is prevented.

The invention thus provides an absolutely sealed closure, adapted to keep the paste clean and free from contamination, which interfere with the proper acover the smooth cylindrical portion of the neck.

What is claimed is:

1. In a closure structure, a discharge neck closed in its central portion and open at one side of such central portion, a cap open at the center and closed over the open side portion of the neck, said cap being internally screw threaded and the neck being externally screw threaded to match the threads of the cap, said neck further having a smooth cylindrical portion beyond the screw threads thereon, a seal within the cap above the screw threaded portion therein and engaging over the smooth cylindrical portion of the neck in both the open and closed positions of the cap to prevent material from within the neck reaching said screw threads.

2. In a closure structure, a discharge neck closed in its central portion and open at one' side of such central portion, a cap open at the center and closed over the open side portion of the neck, said cap being internally screw threaded and the neck being externally screw threaded to match the threads of the cap, said neck further having a smooth cylindrical portion beyond the screw threads thereon, a seal within the cap above the screw threaded portion therein and engaging over the smooth cylindrical portion of the neck in both the open and closed ositions of the cap to prevent material ram within theneck reaching said screw threads, said seal having a portion within the cap (place for the paste to become.

extending inwardly to the central discharge orifice. 3. In a closure structure, a discharge neck closed in its central portion and open at one side of such central portion, a cap open at the center and closed over the open side portion of the neck, said cap being internally screw threaded and the neck being externally screw threaded to match the threads of the ca said neck further having a smooth cy indrical portion beyond the screw threads thereon, a seal within the cap above theextending inwardly to the central discharge orifice and the closed central portion of the neck having a plug projecting past the inwardly extended portion of the seal and fitting closely into the discharge orifice in the cap.

4. In a closure structure, a discharge neck closedin its central portion and open at one side of such central portion, a cap open at the center and closed over the open side portion of the neck, said cap being internally screw threaded and the neck being externally screw threaded to match the threads of the cap, said neck further having a smooth cylindrical portion beyond the screw threads thereon, a seal within the cap above the screw threaded portion therein and engaging over the smooth cylindrical portion of the neck in both the open and closed positions of the cap to prevent material from within the neck reaching said screw threads, and the cap having an inwardly extended bead engaging with a shoulder at the lower end of the screw threads on the neck to limit outward movement of the cap and therefore prevent it from carrying the seal away from the cylindrical portion of the neck.

'In witness whereof, I have hereunto set my hand this 28th day of May, 1926.

LOUIS E. BALTZLEY. 

